changing focus area icons to be a maximum width, instead of filling

opentech/public/home/templates/home/blocks/our_work.html

 {% load wagtailimages_tags home_tags %}
 <div class="focus-area">
-    {% image value.icon fill-80x80 as icon %}
+    {% image value.icon max-80x80 as icon %}
     <img class="focus-area__icon" {{ icon.attrs }}></img>
     <p class="focus-area__teaser">{{ value.description|spanify:1 }}</p>
 </div>